fs/gfs2/lops.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/gfs2_ondisk.h>
  16 #include <linux/bio.h>
  17 #include <linux/fs.h>
  18
  19 #include "gfs2.h"
  20 #include "incore.h"
  21 #include "inode.h"
  22 #include "glock.h"
  23 #include "log.h"
  24 #include "lops.h"
  25 #include "meta_io.h"
  26 #include "recovery.h"
  27 #include "rgrp.h"
  28 #include "trans.h"
  29 #include "util.h"
  30 #include "trace_gfs2.h"
  31
  32 /**
  33  * gfs2_pin - Pin a buffer in memory
  34  * @sdp: The superblock
  35  * @bh: The buffer to be pinned
  36  *
  37  * The log lock must be held when calling this function
  38  */
  39 static void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
  40 {
  41         struct gfs2_bufdata *bd;
  42
  43         BUG_ON(!current->journal_info);
  44
  45         clear_buffer_dirty(bh);
  46         if (test_set_buffer_pinned(bh))
  47                 gfs2_assert_withdraw(sdp, 0);
  48         if (!buffer_uptodate(bh))
  49                 gfs2_io_error_bh(sdp, bh);
  50         bd = bh->b_private;
  51         /* If this buffer is in the AIL and it has already been written
  52          * to in-place disk block, remove it from the AIL.
  53          */
  54         spin_lock(&sdp->sd_ail_lock);
  55         if (bd->bd_ail)
  56                 list_move(&bd->bd_ail_st_list, &bd->bd_ail->ai_ail2_list);
  57         spin_unlock(&sdp->sd_ail_lock);
  58         get_bh(bh);
  59         atomic_inc(&sdp->sd_log_pinned);
  60         trace_gfs2_pin(bd, 1);
  61 }
  62
  63 static bool buffer_is_rgrp(const struct gfs2_bufdata *bd)
  64 {
  65         return bd->bd_gl->gl_name.ln_type == LM_TYPE_RGRP;
  66 }
  67
  68 static void maybe_release_space(struct gfs2_bufdata *bd)
  69 {
  70         struct gfs2_glock *gl = bd->bd_gl;
  71         struct gfs2_sbd *sdp = gl->gl_sbd;
  72         struct gfs2_rgrpd *rgd = gl->gl_object;
  73         unsigned int index = bd->bd_bh->b_blocknr - gl->gl_name.ln_number;
  74         struct gfs2_bitmap *bi = rgd->rd_bits + index;
  75
  76         if (bi->bi_clone == 0)
  77                 return;
  78         if (sdp->sd_args.ar_discard)
  79                 gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bd->bd_bh, bi);
  80         memcpy(bi->bi_clone + bi->bi_offset,
  81                bd->bd_bh->b_data + bi->bi_offset, bi->bi_len);
  82         clear_bit(GBF_FULL, &bi->bi_flags);
  83         rgd->rd_free_clone = rgd->rd_free;
  84 }
  85
  86 /**
  87  * gfs2_unpin - Unpin a buffer
  88  * @sdp: the filesystem the buffer belongs to
  89  * @bh: The buffer to unpin
  90  * @ai:
  91  * @flags: The inode dirty flags
  92  *
  93  */
  94
  95 static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
  96                        struct gfs2_ail *ai)
  97 {
  98         struct gfs2_bufdata *bd = bh->b_private;
  99
 100         BUG_ON(!buffer_uptodate(bh));
 101         BUG_ON(!buffer_pinned(bh));
 102
 103         lock_buffer(bh);
 104         mark_buffer_dirty(bh);
 105         clear_buffer_pinned(bh);
 106
 107         if (buffer_is_rgrp(bd))
 108                 maybe_release_space(bd);
 109
 110         spin_lock(&sdp->sd_ail_lock);
 111         if (bd->bd_ail) {
 112                 list_del(&bd->bd_ail_st_list);
 113                 brelse(bh);
 114         } else {
 115                 struct gfs2_glock *gl = bd->bd_gl;
 116                 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
 117                 atomic_inc(&gl->gl_ail_count);
 118         }
 119         bd->bd_ail = ai;
 120         list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list);
 121         spin_unlock(&sdp->sd_ail_lock);
 122
 123         clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 124         trace_gfs2_pin(bd, 0);
 125         unlock_buffer(bh);
 126         atomic_dec(&sdp->sd_log_pinned);
 127 }
 128
 129
 130 static inline struct gfs2_log_descriptor *bh_log_desc(struct buffer_head *bh)
 131 {
 132         return (struct gfs2_log_descriptor *)bh->b_data;
 133 }
 134
 135 static inline __be64 *bh_log_ptr(struct buffer_head *bh)
 136 {
 137         struct gfs2_log_descriptor *ld = bh_log_desc(bh);
 138         return (__force __be64 *)(ld + 1);
 139 }
 140
 141 static inline __be64 *bh_ptr_end(struct buffer_head *bh)
 142 {
 143         return (__force __be64 *)(bh->b_data + bh->b_size);
 144 }
 145
 146
 147 static struct buffer_head *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type)
 148 {
 149         struct buffer_head *bh = gfs2_log_get_buf(sdp);
 150         struct gfs2_log_descriptor *ld = bh_log_desc(bh);
 151         ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 152         ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
 153         ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
 154         ld->ld_type = cpu_to_be32(ld_type);
 155         ld->ld_length = 0;
 156         ld->ld_data1 = 0;
 157         ld->ld_data2 = 0;
 158         memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
 159         return bh;
 160 }
 161
 162 static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 163 {
 164         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
 165         struct gfs2_meta_header *mh;
 166         struct gfs2_trans *tr;
 167
 168         if (!list_empty(&bd->bd_list_tr))
 169                 return;
 170         tr = current->journal_info;
 171         tr->tr_touched = 1;
 172         tr->tr_num_buf++;
 173         list_add(&bd->bd_list_tr, &tr->tr_list_buf);
 174         if (!list_empty(&le->le_list))
 175                 return;
 176         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 177         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 178         gfs2_meta_check(sdp, bd->bd_bh);
 179         gfs2_pin(sdp, bd->bd_bh);
 180         mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
 181         mh->__pad0 = cpu_to_be64(0);
 182         mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
 183         sdp->sd_log_num_buf++;
 184         list_add(&le->le_list, &sdp->sd_log_le_buf);
 185         tr->tr_num_buf_new++;
 186 }
 187
 188 static void buf_lo_before_commit(struct gfs2_sbd *sdp)
 189 {
 190         struct buffer_head *bh;
 191         struct gfs2_log_descriptor *ld;
 192         struct gfs2_bufdata *bd1 = NULL, *bd2;
 193         unsigned int total;
 194         unsigned int limit;
 195         unsigned int num;
 196         unsigned n;
 197         __be64 *ptr;
 198
 199         limit = buf_limit(sdp);
 200         /* for 4k blocks, limit = 503 */
 201
 202         gfs2_log_lock(sdp);
 203         total = sdp->sd_log_num_buf;
 204         bd1 = bd2 = list_prepare_entry(bd1, &sdp->sd_log_le_buf, bd_le.le_list);
 205         while(total) {
 206                 num = total;
 207                 if (total > limit)
 208                         num = limit;
 209                 gfs2_log_unlock(sdp);
 210                 bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_METADATA);
 211                 gfs2_log_lock(sdp);
 212                 ld = bh_log_desc(bh);
 213                 ptr = bh_log_ptr(bh);
 214                 ld->ld_length = cpu_to_be32(num + 1);
 215                 ld->ld_data1 = cpu_to_be32(num);
 216
 217                 n = 0;
 218                 list_for_each_entry_continue(bd1, &sdp->sd_log_le_buf,
 219                                              bd_le.le_list) {
 220                         *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
 221                         if (++n >= num)
 222                                 break;
 223                 }
 224
 225                 gfs2_log_unlock(sdp);
 226                 submit_bh(WRITE_SYNC, bh);
 227                 gfs2_log_lock(sdp);
 228
 229                 n = 0;
 230                 list_for_each_entry_continue(bd2, &sdp->sd_log_le_buf,
 231                                              bd_le.le_list) {
 232                         get_bh(bd2->bd_bh);
 233                         gfs2_log_unlock(sdp);
 234                         lock_buffer(bd2->bd_bh);
 235                         bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
 236                         submit_bh(WRITE_SYNC, bh);
 237                         gfs2_log_lock(sdp);
 238                         if (++n >= num)
 239                                 break;
 240                 }
 241
 242                 BUG_ON(total < num);
 243                 total -= num;
 244         }
 245         gfs2_log_unlock(sdp);
 246 }
 247
 248 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 249 {
 250         struct list_head *head = &sdp->sd_log_le_buf;
 251         struct gfs2_bufdata *bd;
 252
 253         while (!list_empty(head)) {
 254                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 255                 list_del_init(&bd->bd_le.le_list);
 256                 sdp->sd_log_num_buf--;
 257
 258                 gfs2_unpin(sdp, bd->bd_bh, ai);
 259         }
 260         gfs2_assert_warn(sdp, !sdp->sd_log_num_buf);
 261 }
 262
 263 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
 264                                struct gfs2_log_header_host *head, int pass)
 265 {
 266         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 267
 268         if (pass != 0)
 269                 return;
 270
 271         sdp->sd_found_blocks = 0;
 272         sdp->sd_replayed_blocks = 0;
 273 }
 274
 275 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 276                                 struct gfs2_log_descriptor *ld, __be64 *ptr,
 277                                 int pass)
 278 {
 279         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 280         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 281         struct gfs2_glock *gl = ip->i_gl;
 282         unsigned int blks = be32_to_cpu(ld->ld_data1);
 283         struct buffer_head *bh_log, *bh_ip;
 284         u64 blkno;
 285         int error = 0;
 286
 287         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
 288                 return 0;
 289
 290         gfs2_replay_incr_blk(sdp, &start);
 291
 292         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 293                 blkno = be64_to_cpu(*ptr++);
 294
 295                 sdp->sd_found_blocks++;
 296
 297                 if (gfs2_revoke_check(sdp, blkno, start))
 298                         continue;
 299
 300                 error = gfs2_replay_read_block(jd, start, &bh_log);
 301                 if (error)
 302                         return error;
 303
 304                 bh_ip = gfs2_meta_new(gl, blkno);
 305                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 306
 307                 if (gfs2_meta_check(sdp, bh_ip))
 308                         error = -EIO;
 309                 else
 310                         mark_buffer_dirty(bh_ip);
 311
 312                 brelse(bh_log);
 313                 brelse(bh_ip);
 314
 315                 if (error)
 316                         break;
 317
 318                 sdp->sd_replayed_blocks++;
 319         }
 320
 321         return error;
 322 }
 323
 324 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 325 {
 326         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 327         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 328
 329         if (error) {
 330                 gfs2_meta_sync(ip->i_gl);
 331                 return;
 332         }
 333         if (pass != 1)
 334                 return;
 335
 336         gfs2_meta_sync(ip->i_gl);
 337
 338         fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
 339                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
 340 }
 341
 342 static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 343 {
 344         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
 345         struct gfs2_glock *gl = bd->bd_gl;
 346         struct gfs2_trans *tr;
 347
 348         tr = current->journal_info;
 349         tr->tr_touched = 1;
 350         tr->tr_num_revoke++;
 351         sdp->sd_log_num_revoke++;
 352         atomic_inc(&gl->gl_revokes);
 353         set_bit(GLF_LFLUSH, &gl->gl_flags);
 354         list_add(&le->le_list, &sdp->sd_log_le_revoke);
 355 }
 356
 357 static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
 358 {
 359         struct gfs2_log_descriptor *ld;
 360         struct gfs2_meta_header *mh;
 361         struct buffer_head *bh;
 362         unsigned int offset;
 363         struct list_head *head = &sdp->sd_log_le_revoke;
 364         struct gfs2_bufdata *bd;
 365
 366         if (!sdp->sd_log_num_revoke)
 367                 return;
 368
 369         bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE);
 370         ld = bh_log_desc(bh);
 371         ld->ld_length = cpu_to_be32(gfs2_struct2blk(sdp, sdp->sd_log_num_revoke,
 372                                                     sizeof(u64)));
 373         ld->ld_data1 = cpu_to_be32(sdp->sd_log_num_revoke);
 374         offset = sizeof(struct gfs2_log_descriptor);
 375
 376         list_for_each_entry(bd, head, bd_le.le_list) {
 377                 sdp->sd_log_num_revoke--;
 378
 379                 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
 380                         submit_bh(WRITE_SYNC, bh);
 381
 382                         bh = gfs2_log_get_buf(sdp);
 383                         mh = (struct gfs2_meta_header *)bh->b_data;
 384                         mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
 385                         mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
 386                         mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
 387                         offset = sizeof(struct gfs2_meta_header);
 388                 }
 389
 390                 *(__be64 *)(bh->b_data + offset) = cpu_to_be64(bd->bd_blkno);
 391                 offset += sizeof(u64);
 392         }
 393         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
 394
 395         submit_bh(WRITE_SYNC, bh);
 396 }
 397
 398 static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 399 {
 400         struct list_head *head = &sdp->sd_log_le_revoke;
 401         struct gfs2_bufdata *bd;
 402         struct gfs2_glock *gl;
 403
 404         while (!list_empty(head)) {
 405                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 406                 list_del_init(&bd->bd_le.le_list);
 407                 gl = bd->bd_gl;
 408                 atomic_dec(&gl->gl_revokes);
 409                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
 410                 kmem_cache_free(gfs2_bufdata_cachep, bd);
 411         }
 412 }
 413
 414 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
 415                                   struct gfs2_log_header_host *head, int pass)
 416 {
 417         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 418
 419         if (pass != 0)
 420                 return;
 421
 422         sdp->sd_found_revokes = 0;
 423         sdp->sd_replay_tail = head->lh_tail;
 424 }
 425
 426 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 427                                    struct gfs2_log_descriptor *ld, __be64 *ptr,
 428                                    int pass)
 429 {
 430         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 431         unsigned int blks = be32_to_cpu(ld->ld_length);
 432         unsigned int revokes = be32_to_cpu(ld->ld_data1);
 433         struct buffer_head *bh;
 434         unsigned int offset;
 435         u64 blkno;
 436         int first = 1;
 437         int error;
 438
 439         if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
 440                 return 0;
 441
 442         offset = sizeof(struct gfs2_log_descriptor);
 443
 444         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 445                 error = gfs2_replay_read_block(jd, start, &bh);
 446                 if (error)
 447                         return error;
 448
 449                 if (!first)
 450                         gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
 451
 452                 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
 453                         blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
 454
 455                         error = gfs2_revoke_add(sdp, blkno, start);
 456                         if (error < 0) {
 457                                 brelse(bh);
 458                                 return error;
 459                         }
 460                         else if (error)
 461                                 sdp->sd_found_revokes++;
 462
 463                         if (!--revokes)
 464                                 break;
 465                         offset += sizeof(u64);
 466                 }
 467
 468                 brelse(bh);
 469                 offset = sizeof(struct gfs2_meta_header);
 470                 first = 0;
 471         }
 472
 473         return 0;
 474 }
 475
 476 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 477 {
 478         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 479
 480         if (error) {
 481                 gfs2_revoke_clean(sdp);
 482                 return;
 483         }
 484         if (pass != 1)
 485                 return;
 486
 487         fs_info(sdp, "jid=%u: Found %u revoke tags\n",
 488                 jd->jd_jid, sdp->sd_found_revokes);
 489
 490         gfs2_revoke_clean(sdp);
 491 }
 492
 493 /**
 494  * databuf_lo_add - Add a databuf to the transaction.
 495  *
 496  * This is used in two distinct cases:
 497  * i) In ordered write mode
 498  *    We put the data buffer on a list so that we can ensure that its
 499  *    synced to disk at the right time
 500  * ii) In journaled data mode
 501  *    We need to journal the data block in the same way as metadata in
 502  *    the functions above. The difference is that here we have a tag
 503  *    which is two __be64's being the block number (as per meta data)
 504  *    and a flag which says whether the data block needs escaping or
 505  *    not. This means we need a new log entry for each 251 or so data
 506  *    blocks, which isn't an enormous overhead but twice as much as
 507  *    for normal metadata blocks.
 508  */
 509 static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 510 {
 511         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
 512         struct gfs2_trans *tr = current->journal_info;
 513         struct address_space *mapping = bd->bd_bh->b_page->mapping;
 514         struct gfs2_inode *ip = GFS2_I(mapping->host);
 515
 516         if (tr) {
 517                 if (!list_empty(&bd->bd_list_tr))
 518                         return;
 519                 tr->tr_touched = 1;
 520                 if (gfs2_is_jdata(ip)) {
 521                         tr->tr_num_buf++;
 522                         list_add(&bd->bd_list_tr, &tr->tr_list_buf);
 523                 }
 524         }
 525         if (!list_empty(&le->le_list))
 526                 return;
 527
 528         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 529         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 530         if (gfs2_is_jdata(ip)) {
 531                 gfs2_pin(sdp, bd->bd_bh);
 532                 tr->tr_num_databuf_new++;
 533                 sdp->sd_log_num_databuf++;
 534                 list_add_tail(&le->le_list, &sdp->sd_log_le_databuf);
 535         } else {
 536                 list_add_tail(&le->le_list, &sdp->sd_log_le_ordered);
 537         }
 538 }
 539
 540 static void gfs2_check_magic(struct buffer_head *bh)
 541 {
 542         void *kaddr;
 543         __be32 *ptr;
 544
 545         clear_buffer_escaped(bh);
 546         kaddr = kmap_atomic(bh->b_page, KM_USER0);
 547         ptr = kaddr + bh_offset(bh);
 548         if (*ptr == cpu_to_be32(GFS2_MAGIC))
 549                 set_buffer_escaped(bh);
 550         kunmap_atomic(kaddr, KM_USER0);
 551 }
 552
 553 static void gfs2_write_blocks(struct gfs2_sbd *sdp, struct buffer_head *bh,
 554                               struct list_head *list, struct list_head *done,
 555                               unsigned int n)
 556 {
 557         struct buffer_head *bh1;
 558         struct gfs2_log_descriptor *ld;
 559         struct gfs2_bufdata *bd;
 560         __be64 *ptr;
 561
 562         if (!bh)
 563                 return;
 564
 565         ld = bh_log_desc(bh);
 566         ld->ld_length = cpu_to_be32(n + 1);
 567         ld->ld_data1 = cpu_to_be32(n);
 568
 569         ptr = bh_log_ptr(bh);
 570
 571         get_bh(bh);
 572         submit_bh(WRITE_SYNC, bh);
 573         gfs2_log_lock(sdp);
 574         while(!list_empty(list)) {
 575                 bd = list_entry(list->next, struct gfs2_bufdata, bd_le.le_list);
 576                 list_move_tail(&bd->bd_le.le_list, done);
 577                 get_bh(bd->bd_bh);
 578                 while (be64_to_cpu(*ptr) != bd->bd_bh->b_blocknr) {
 579                         gfs2_log_incr_head(sdp);
 580                         ptr += 2;
 581                 }
 582                 gfs2_log_unlock(sdp);
 583                 lock_buffer(bd->bd_bh);
 584                 if (buffer_escaped(bd->bd_bh)) {
 585                         void *kaddr;
 586                         bh1 = gfs2_log_get_buf(sdp);
 587                         kaddr = kmap_atomic(bd->bd_bh->b_page, KM_USER0);
 588                         memcpy(bh1->b_data, kaddr + bh_offset(bd->bd_bh),
 589                                bh1->b_size);
 590                         kunmap_atomic(kaddr, KM_USER0);
 591                         *(__be32 *)bh1->b_data = 0;
 592                         clear_buffer_escaped(bd->bd_bh);
 593                         unlock_buffer(bd->bd_bh);
 594                         brelse(bd->bd_bh);
 595                 } else {
 596                         bh1 = gfs2_log_fake_buf(sdp, bd->bd_bh);
 597                 }
 598                 submit_bh(WRITE_SYNC, bh1);
 599                 gfs2_log_lock(sdp);
 600                 ptr += 2;
 601         }
 602         gfs2_log_unlock(sdp);
 603         brelse(bh);
 604 }
 605
 606 /**
 607  * databuf_lo_before_commit - Scan the data buffers, writing as we go
 608  *
 609  */
 610
 611 static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
 612 {
 613         struct gfs2_bufdata *bd = NULL;
 614         struct buffer_head *bh = NULL;
 615         unsigned int n = 0;
 616         __be64 *ptr = NULL, *end = NULL;
 617         LIST_HEAD(processed);
 618         LIST_HEAD(in_progress);
 619
 620         gfs2_log_lock(sdp);
 621         while (!list_empty(&sdp->sd_log_le_databuf)) {
 622                 if (ptr == end) {
 623                         gfs2_log_unlock(sdp);
 624                         gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
 625                         n = 0;
 626                         bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_JDATA);
 627                         ptr = bh_log_ptr(bh);
 628                         end = bh_ptr_end(bh) - 1;
 629                         gfs2_log_lock(sdp);
 630                         continue;
 631                 }
 632                 bd = list_entry(sdp->sd_log_le_databuf.next, struct gfs2_bufdata, bd_le.le_list);
 633                 list_move_tail(&bd->bd_le.le_list, &in_progress);
 634                 gfs2_check_magic(bd->bd_bh);
 635                 *ptr++ = cpu_to_be64(bd->bd_bh->b_blocknr);
 636                 *ptr++ = cpu_to_be64(buffer_escaped(bh) ? 1 : 0);
 637                 n++;
 638         }
 639         gfs2_log_unlock(sdp);
 640         gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
 641         gfs2_log_lock(sdp);
 642         list_splice(&processed, &sdp->sd_log_le_databuf);
 643         gfs2_log_unlock(sdp);
 644 }
 645
 646 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 647                                     struct gfs2_log_descriptor *ld,
 648                                     __be64 *ptr, int pass)
 649 {
 650         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 651         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 652         struct gfs2_glock *gl = ip->i_gl;
 653         unsigned int blks = be32_to_cpu(ld->ld_data1);
 654         struct buffer_head *bh_log, *bh_ip;
 655         u64 blkno;
 656         u64 esc;
 657         int error = 0;
 658
 659         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
 660                 return 0;
 661
 662         gfs2_replay_incr_blk(sdp, &start);
 663         for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
 664                 blkno = be64_to_cpu(*ptr++);
 665                 esc = be64_to_cpu(*ptr++);
 666
 667                 sdp->sd_found_blocks++;
 668
 669                 if (gfs2_revoke_check(sdp, blkno, start))
 670                         continue;
 671
 672                 error = gfs2_replay_read_block(jd, start, &bh_log);
 673                 if (error)
 674                         return error;
 675
 676                 bh_ip = gfs2_meta_new(gl, blkno);
 677                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
 678
 679                 /* Unescape */
 680                 if (esc) {
 681                         __be32 *eptr = (__be32 *)bh_ip->b_data;
 682                         *eptr = cpu_to_be32(GFS2_MAGIC);
 683                 }
 684                 mark_buffer_dirty(bh_ip);
 685
 686                 brelse(bh_log);
 687                 brelse(bh_ip);
 688
 689                 sdp->sd_replayed_blocks++;
 690         }
 691
 692         return error;
 693 }
 694
 695 /* FIXME: sort out accounting for log blocks etc. */
 696
 697 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
 698 {
 699         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 700         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 701
 702         if (error) {
 703                 gfs2_meta_sync(ip->i_gl);
 704                 return;
 705         }
 706         if (pass != 1)
 707                 return;
 708
 709         /* data sync? */
 710         gfs2_meta_sync(ip->i_gl);
 711
 712         fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
 713                 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
 714 }
 715
 716 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 717 {
 718         struct list_head *head = &sdp->sd_log_le_databuf;
 719         struct gfs2_bufdata *bd;
 720
 721         while (!list_empty(head)) {
 722                 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
 723                 list_del_init(&bd->bd_le.le_list);
 724                 sdp->sd_log_num_databuf--;
 725                 gfs2_unpin(sdp, bd->bd_bh, ai);
 726         }
 727         gfs2_assert_warn(sdp, !sdp->sd_log_num_databuf);
 728 }
 729
 730
 731 const struct gfs2_log_operations gfs2_buf_lops = {
 732         .lo_add = buf_lo_add,
 733         .lo_before_commit = buf_lo_before_commit,
 734         .lo_after_commit = buf_lo_after_commit,
 735         .lo_before_scan = buf_lo_before_scan,
 736         .lo_scan_elements = buf_lo_scan_elements,
 737         .lo_after_scan = buf_lo_after_scan,
 738         .lo_name = "buf",
 739 };
 740
 741 const struct gfs2_log_operations gfs2_revoke_lops = {
 742         .lo_add = revoke_lo_add,
 743         .lo_before_commit = revoke_lo_before_commit,
 744         .lo_after_commit = revoke_lo_after_commit,
 745         .lo_before_scan = revoke_lo_before_scan,
 746         .lo_scan_elements = revoke_lo_scan_elements,
 747         .lo_after_scan = revoke_lo_after_scan,
 748         .lo_name = "revoke",
 749 };
 750
 751 const struct gfs2_log_operations gfs2_rg_lops = {
 752         .lo_name = "rg",
 753 };
 754
 755 const struct gfs2_log_operations gfs2_databuf_lops = {
 756         .lo_add = databuf_lo_add,
 757         .lo_before_commit = databuf_lo_before_commit,
 758         .lo_after_commit = databuf_lo_after_commit,
 759         .lo_scan_elements = databuf_lo_scan_elements,
 760         .lo_after_scan = databuf_lo_after_scan,
 761         .lo_name = "databuf",
 762 };
 763
 764 const struct gfs2_log_operations *gfs2_log_ops[] = {
 765         &gfs2_databuf_lops,
 766         &gfs2_buf_lops,
 767         &gfs2_rg_lops,
 768         &gfs2_revoke_lops,
 769         NULL,
 770 };
 771